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Title: In-tank, on-shot characterization of the OMEGA laser system focal spot

Abstract

Direct-drive fusion implosion experiments using the 60-beam OMEGA Laser System require ~1% rms uniformity on target. Measurements from laser diagnostics indicate that beam-to-beam power variation has been sufficiently reduced such that the uniformity nearly meets this requirement; however, experimental results suggest otherwise. To better understand this discrepancy, a full-beam-in-tank diagnostic has been developed to characterize the on-shot, full-energy focal spot of a single beam inside the target chamber using a small sample of the beam from the final optic assembly. In this paper, we describe the diagnostic and present the results of commissioning experiments.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Rochester, NY (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1502136
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Proc. SPIE
Additional Journal Information:
Journal Volume: 10898; Conference: SPIE LASE 2019, San Francisco, CA (United States), 2-7 Feb 2019
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; diagnostics; laser systems engineering; wavefronts; near field optics; CCD cameras; fusion energy

Citation Formats

Waxer, Leon J., Bauer, Katelynn, Cost, Emil, Heimbueger, Matthew, Kelly, John H., Kobilansky, Victor, Morse, Samuel, Nelson, David, Peck, Robert, Rinefierd, Robert, Sampat, Siddharth, Shoup, Milton J., Weiner, David, Weselak, Gregory, and Zou, Jun. In-tank, on-shot characterization of the OMEGA laser system focal spot. United States: N. p., 2019. Web. doi:10.1117/12.2506792.
Waxer, Leon J., Bauer, Katelynn, Cost, Emil, Heimbueger, Matthew, Kelly, John H., Kobilansky, Victor, Morse, Samuel, Nelson, David, Peck, Robert, Rinefierd, Robert, Sampat, Siddharth, Shoup, Milton J., Weiner, David, Weselak, Gregory, & Zou, Jun. In-tank, on-shot characterization of the OMEGA laser system focal spot. United States. https://doi.org/10.1117/12.2506792
Waxer, Leon J., Bauer, Katelynn, Cost, Emil, Heimbueger, Matthew, Kelly, John H., Kobilansky, Victor, Morse, Samuel, Nelson, David, Peck, Robert, Rinefierd, Robert, Sampat, Siddharth, Shoup, Milton J., Weiner, David, Weselak, Gregory, and Zou, Jun. Mon . "In-tank, on-shot characterization of the OMEGA laser system focal spot". United States. https://doi.org/10.1117/12.2506792. https://www.osti.gov/servlets/purl/1502136.
@article{osti_1502136,
title = {In-tank, on-shot characterization of the OMEGA laser system focal spot},
author = {Waxer, Leon J. and Bauer, Katelynn and Cost, Emil and Heimbueger, Matthew and Kelly, John H. and Kobilansky, Victor and Morse, Samuel and Nelson, David and Peck, Robert and Rinefierd, Robert and Sampat, Siddharth and Shoup, Milton J. and Weiner, David and Weselak, Gregory and Zou, Jun},
abstractNote = {Direct-drive fusion implosion experiments using the 60-beam OMEGA Laser System require ~1% rms uniformity on target. Measurements from laser diagnostics indicate that beam-to-beam power variation has been sufficiently reduced such that the uniformity nearly meets this requirement; however, experimental results suggest otherwise. To better understand this discrepancy, a full-beam-in-tank diagnostic has been developed to characterize the on-shot, full-energy focal spot of a single beam inside the target chamber using a small sample of the beam from the final optic assembly. In this paper, we describe the diagnostic and present the results of commissioning experiments.},
doi = {10.1117/12.2506792},
journal = {Proc. SPIE},
number = ,
volume = 10898,
place = {United States},
year = {Mon Mar 04 00:00:00 EST 2019},
month = {Mon Mar 04 00:00:00 EST 2019}
}

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Cited by: 2 works
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Works referenced in this record:

National direct-drive program on OMEGA and the National Ignition Facility
journal, October 2016


Random Phasing of High-Power Lasers for Uniform Target Acceleration and Plasma-Instability Suppression
journal, September 1984


Direct-drive-implosion experiments with enhanced fluence balance on OMEGA
journal, January 2004

  • Marshall, F. J.; Delettrez, J. A.; Epstein, R.
  • Physics of Plasmas, Vol. 11, Issue 1
  • DOI: 10.1063/1.1628234

A focal-spot diagnostic for on-shot characterization of high-energy petawatt lasers
journal, January 2008


Works referencing / citing this record:

Inferred UV fluence focal-spot profiles from soft x-ray pinhole-camera measurements on OMEGA
journal, February 2020

  • Theobald, W.; Sorce, C.; Donaldson, W. R.
  • Review of Scientific Instruments, Vol. 91, Issue 2
  • DOI: 10.1063/1.5120708

The impact of magnetic fields on cold streams feeding galaxies
journal, August 2019

  • Berlok, Thomas; Pfrommer, Christoph
  • Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 3
  • DOI: 10.1093/mnras/stz2347